Acoustic-electric-force simultaneous measurement device and method considering stress spindle rotation compressed air energy storage

Abstract

The invention discloses an acoustic-electric-force simultaneous measurement device considering stress spindle rotation compressed air energy storage, and relates to the technical field of rock mass mechanical test equipment. The device comprises a force application oil cavity structure, a confining pressure barrel structure and a force transmission structure, wherein a force application oil cavity is formed in the force application oil cavity structure; one end of the first channel is connected with the upper end of the sample, and the other end sequentially penetrates through the upper pressure head and the lower base to communicate with the outside; one end of the second channel is connected with the lower end of the sample, and the other end sequentially penetrates through the lower pressing head and the lower base to communicate with the outside. The temperature control system, the ultrasonic testing system and the resistivity testing system are freely combined and selected in a narrow reaction space according to test requirements. The invention further relates to a use method of the sound-electricity-force simultaneous measurement device considering stress spindle rotation compressed air energy storage.

Description

Technical Field

[0001] The present invention relates to the technical field of rock mechanics test equipment, and more specifically, it is a device for jointly measuring sound, electricity, and force in compressed air energy storage considering the rotation of the stress principal axis. The present invention also relates to a method for using such a device for jointly measuring sound, electricity, and force in compressed air energy storage considering the rotation of the stress principal axis. Background Art

[0002] The triaxial rock experiment is an important method in rock mechanics research, and its test results can more comprehensively reflect the mechanical properties of rock and soil under the initial in-situ stress conditions, which is of great significance for engineering design; with the continuous increase of deep rock mass projects in China, complex engineering geological problems such as active faults, high in-situ stress, high geothermal temperature, and underground natural gas storage have emerged. Therefore, carrying out indoor mechanical experiment research under different environments is an important scientific issue in the current field of rock mechanics.

[0003] At present, triaxial compression tests mainly include uniaxial, conventional triaxial, true triaxial, dynamic impact, and rheological tests, and cannot well simulate complex geological environments in the laboratory. For example, the test device of the Chinese patent "A Rock Hollow Cylindrical Torsional Shear Apparatus for Improving the Accuracy of Torque Application" (Application No.: 201611029623.7) uses conventional strain gauges to measure the inner ring strain of the hollow cylinder, resulting in poor measurement accuracy, and it can only be applied to a true-false triaxial torsional shear test at normal temperature, with a relatively single function and lacking a triaxial test considering the coupling of multiple physical fields such as rock static load, rheology, temperature, ultrasonic wave, and resistivity.

[0004] Therefore, due to the gradual complexity of engineering geological conditions, in order to improve the functions of existing rock mechanics test and measurement technologies, study deeper rock mechanics tests, realize multi-field coupling test and measurement technologies for rock static load, rheology, temperature, ultrasonic wave, resistivity, etc., and at the same time enable compressed air energy storage test research, it is necessary to develop a device for jointly measuring sound, electricity, and force in compressed air energy storage considering the rotation of the stress principal axis and its use method. Summary of the Invention

[0005] The first object of the present invention is to overcome the deficiencies of the above background art, and provide a device for jointly measuring sound, electricity, and force in compressed air energy storage considering the rotation of the stress principal axis.

[0006] The second object of the present invention is to provide a method for using such a device for jointly measuring sound, electricity, and force in compressed air energy storage considering the rotation of the stress principal axis.

[0007] In order to achieve the above first object, the technical solution of the present invention is: A device for jointly measuring sound, electricity, and force in compressed air energy storage considering the rotation of the stress principal axis, characterized in that: it includes a force application oil chamber structure, a confining pressure barrel structure, and a force transmission structure, and the force application oil chamber structure has a force application oil chamber inside;

[0008] The confining pressure barrel structure is located at the bottom of the force - applying oil chamber structure, and the inside of the confining pressure barrel structure is the confining pressure barrel inner cavity;

[0009] The force - transmitting structure includes a force - transmitting shaft, a piston, and a combined torque - transmitting structure; the upper end of the force - transmitting shaft is connected to the combined torque - transmitting structure, and the lower end sequentially penetrates the force - applying oil chamber structure, the force - applying oil chamber, and the confining pressure barrel structure from top to bottom and is located inside the confining pressure barrel inner cavity; the piston is sleeved on the part of the force - transmitting shaft located in the force - applying oil chamber, and the piston divides the force - applying oil chamber into an upper force - applying oil chamber and a lower force - applying oil chamber;

[0010] The upper force - applying oil chamber, the lower force - applying oil chamber, the top of the confining pressure barrel inner cavity, and the bottom of the confining pressure barrel inner cavity are all provided with oil - transmission channels for connecting with external hydraulic components;

[0011] The sample is located between the lower end of the force - transmitting shaft and the inner wall of the bottom of the confining pressure barrel inner cavity;

[0012] The lower end of the force - transmitting shaft is connected with an upper pressure head through a buckle, the inner wall of the bottom of the confining pressure barrel inner cavity is provided with a lower pressure head, and the sample is located between the upper pressure head and the lower pressure head;

[0013] The confining pressure barrel structure includes a rigid sleeve, a lower base, and an upper base. The lower end of the rigid sleeve is fixed to the lower base, and the upper end is fixed to the upper base. The rigid sleeve, the lower base, and the upper base form the confining pressure barrel inner cavity;

[0014] The upper end of the force - applying oil chamber structure is provided with a sealing cover, and the lower end is fixedly connected to the upper base;

[0015] One end of the first channel is connected to the upper end of the sample, and the other end sequentially penetrates the upper pressure head, the lower base and communicates with the outside; one end of the second channel is connected to the lower end of the sample, and the other end sequentially penetrates the lower pressure head, the lower base and communicates with the outside.

[0016] It further includes an ultrasonic transmitting and receiving device, an ultrasonic signal wire, an ultrasonic compression spring, and an ultrasonic testing system; ultrasonic transmitting and receiving devices are arranged at the lower end of the upper pressure head and the upper end of the lower pressure head, the ultrasonic compression spring is arranged on the ultrasonic transmitting and receiving device, and one end of the ultrasonic signal wire is connected to the ultrasonic compression spring and the other end is connected to the ultrasonic testing system;

[0017] It further includes a lateral displacement sensor and an axial displacement sensor. The lateral displacement sensor is arranged on the left and right sides of the sample, and the lower end of the axial displacement sensor is connected to the lower base and the upper end is connected to the extension part of the upper pressure head;

[0018] It further includes a temperature control system. The temperature control system includes a temperature - controlled outer lining, a temperature sensor, and a temperature control console; the temperature - controlled outer lining wraps the force - applying oil chamber structure and the confining pressure barrel structure, the temperature - controlled outer lining is connected to the temperature control console through a temperature wire; the temperature sensor is arranged on the inner wall of the top of the confining pressure barrel inner cavity;

[0019] It also includes a resistivity testing system, which includes an upper electrode plate, a lower electrode plate, wires, and a resistivity testing system. The upper electrode plate is installed at the upper end of the sample, and the lower electrode plate is installed at the lower end of the sample. The upper electrode plate and the lower electrode plate are respectively connected to the resistivity testing system through wires.

[0020] In the above technical solution, it also includes a gas cylinder, which is sequentially connected to the second channel through a first flow meter, a first flow and pressure gauge, and a gas stop valve. The gas cylinder is provided with a gas cylinder switch valve; the first channel is sequentially connected with a second flow meter, a second flow and pressure gauge, and a stop valve outside the lower base.

[0021] In the above technical solution, it also includes an internal strain testing device, which is located inside the sample. The internal strain testing device sequentially includes an LVDT housing, a conversion cone housing, and a base housing from top to bottom; the upper end of the LVDT is outside the LVDT housing and the lower end is inside the LVDT housing; the upper end of the conversion cone is inside the LVDT housing and contacts the lower end of the LVDT, and the lower end is inside the conversion cone housing; the upper end of the base is inside the base housing;

[0022] One end of a plurality of compression probes contacts the inner wall of the sample, and the other end radially passes through the conversion cone housing and contacts the lower end of the conversion cone. The contact part between the compression probe and the conversion cone is an inclined platform, and a semi-compression spring is arranged inside the compression probe.

[0023] In the above technical solution, the inclination angle of the inclined platform is 45°; a combined fixing gasket is arranged between the LVDT housing and the conversion cone housing.

[0024] In order to achieve the above second object, the technical solution of the present invention is: considering the use method of the stress main axis rotation compressed air energy storage sound - electricity - force combined measurement device, which is characterized by including the following steps:

[0025] Step 1: Install a hollow rock sample specimen, bond the lower end of the specimen to the lower press head with epoxy resin glue, and bond the upper end of the specimen to the upper press head with epoxy resin glue;

[0026] Step 2: Install the lower base, dock and seal the rigid sleeve with the lower base to form a reaction space for the specimen; the upper press head is snap - connected to the force - transmitting shaft, and the lower end of the force - applying oil cavity structure is fixedly connected to the upper base;

[0027] Step 3: Use the controller to perform peripheral confining pressure oil injection through the oil - delivery channel at the top of the inner cavity of the confining pressure barrel, and the first channel injects oil into the cavity inside the hollow rock sample specimen to provide internal confining pressure; inject oil into the axial force - applying oil cavity through the oil - delivery channel of the upper force - applying oil cavity axially to push the piston to apply axial force; drive the force - transmitting shaft to make a circular motion through the combined torque transmission structure to provide torque for the hollow rock sample specimen;

[0028] Step 4: Turn on the temperature control system, heat the measuring device with a temperature-controlled outer lining, keep the temperature constant after reaching the set expected test target temperature, and conduct the rock hollow cylinder torsional shear test at different temperatures;

[0029] Step 5: When performing the resistivity test, after the upper electrode plate discharges the sample, the current is transmitted through the lower electrode plate and the wire to the resistivity test system, and then the change in resistivity under different environmental conditions is obtained;

[0030] Step 6: When performing the ultrasonic experiment test, the ultrasonic signal wire transmits the signal to the ultrasonic test system to detect the waveform of the internal structure change of the sample during the experiment, and complete the relevant ultrasonic test;

[0031] Step 7: When performing the compressed air energy storage test, open the gas cylinder switch valve and the air stop valve, observe the first flow meter and the first flow pressure gauge, record their values, adjust the air stop valve to the test target pressure, and observe the second flow meter and the second flow pressure gauge by adjusting the stop valve until the target pressure required for the test; the temperature-coupled torsional shear test simulates the compressed air energy storage test under different environments;

[0032] Step 8: Oil is transported to the lower force application oil cavity through the oil delivery channel of the lower force application oil cavity to push the piston upward for unloading. At the same time, oil is pumped out for unloading through the oil delivery channel at the bottom of the inner cavity of the confining pressure barrel in the reaction space, and oil is pumped out for unloading inside the sample through the second channel. After removing the lower base, the sample is removed to complete the multi-parameter measurement.

[0033] In the above technical solution, in Step 1, the internal strain test device is placed inside the sample and fixed;

[0034] The usage method of the internal strain test device includes the following steps:

[0035] The compression probe presses against the inner wall of the sample to elongate or contract;

[0036] When the semi-compressed spring contracts, the tip of the conversion cone moves upward to the upper end of the inclined platform, causing the conversion cone to rise and driving the LVDT to rise;

[0037] When the semi-compressed spring elongates, the tip of the conversion cone moves downward to the lower end of the inclined platform, causing the conversion cone to descend and driving the LVDT to descend;

[0038] The inclined platform is made at 45°, and the height of the rise or fall of the conversion cone is the displacement generated in the transverse direction of the sample.

[0039] Compared with the prior art, the present invention has the following advantages:

[0040] 1) Due to the limited internal space size of the specimen, it is impossible to place a radial displacement sensor, while the vertical space is sufficient. The present invention designs an internal strain test device that converts the internal radial displacement of the rock into vertical displacement, and the measurement accuracy of the internal ring strain of the specimen is high.

[0041] 2) The present invention designs a temperature control system to simulate the strength of rocks under high-temperature and high-pressure geological conditions, and can carry out rock hollow cylinder torsional shear tests under high-temperature and high-pressure environments.

[0042] 3) The present invention designs an ultrasonic test system, which can measure the change of the internal structure of the rock specimen during the test and complete the data analysis of the waveform change during the test.

[0043] 4) The present invention designs a resistivity test system to measure the resistivity of rocks under complex stress paths.

[0044] 5) The temperature control system, ultrasonic test system, and resistivity test system of the present invention can be freely combined and selected according to the test requirements in a narrow reaction space. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 is a schematic structural diagram of the present invention Figure 1 。

[0046] Figure 2 is a schematic structural diagram of the present invention Figure 2 。

[0047] Figure 3 is a schematic structural diagram of the internal strain test device.

[0048] Figure 4 is a cross-section of the internal strain test device Figure 1 。

[0049] Figure 5 is a cross-section of the internal strain test device Figure 2 。

[0050] Among them, A - sample, 100 - force - applying oil cavity structure, 110 - force - applying oil cavity, 111 - upper force - applying oil cavity, 112 - lower force - applying oil cavity, 120 - sealing cover, 121 - first fixing bolt, 200 - confining pressure barrel structure, 210 - confining pressure barrel inner cavity, 220 - lower pressure head, 221 - second fixing bolt, 231 - rigid sleeve, 232 - lower base, 233 - upper base, 234 - third bolt, 300 - force - transmitting structure, 310 - force - transmitting shaft, 320 - piston, 330 - combined torque - transmitting structure, 331 - steel bolt, 340 - upper pressure head, 341 - extension part, 400 - internal strain testing device, 410 - LVDT housing, 411 - LVDT, 420 - conversion cone housing, 421 - conversion cone, 430 - base housing, 431 - base, 440 - compression probe, 441 - inclined platform, 442 - semi - compression spring, 450 - combined fixing gasket, 510 - oil delivery channel, 520 - first channel, 530 - second channel, 540 - gas cylinder switch valve, 550 - gas cylinder, 561 - first flow meter, 562 - second flow meter, 571 - first flow and pressure gauge, 572 - second flow and pressure gauge, 581 - air stop valve, 582 - stop valve, 640 - ultrasonic transmitting and receiving device, 650 - ultrasonic signal wire, 660 - ultrasonic compression spring, 670 - ultrasonic testing system, 800 - temperature control system, 810 - temperature control outer lining, 811 - temperature wire, 820 - temperature sensor, 830 - temperature console. Specific implementation manners

[0051] The implementation of the present invention will be described in detail below with reference to the accompanying drawings. However, they do not constitute a limitation to the present invention and are only for illustration purposes. At the same time, the advantages of the present invention will become clearer and easier to understand through the description.

[0052] Referring to the accompanying drawings, it can be seen that for the stress - main - axis - rotation compressed - air energy - storage acoustic - electro - mechanical combined measurement device, it is characterized in that it includes a force - applying oil cavity structure 100, a confining pressure barrel structure 200, and a force - transmitting structure 300. The force - applying oil cavity 110 is inside the force - applying oil cavity structure 100;

[0053] The confining pressure barrel structure 200 is located at the bottom of the force - applying oil cavity structure 100, and the confining pressure barrel inner cavity 210 is inside the confining pressure barrel structure 200;

[0054] The force transmission structure 300 includes a force transmission shaft 310, a piston 320, and a combined torque transmission structure 330; the upper end of the force transmission shaft 310 is connected to the combined torque transmission structure 330, and the lower end sequentially penetrates the force application oil chamber structure 100, the force application oil chamber 110, and the confining pressure barrel structure 200 from top to bottom and is located within the inner cavity 210 of the confining pressure barrel; the piston 320 is sleeved on the part of the force transmission shaft 310 located in the force application oil chamber 110, and the piston 320 divides the force application oil chamber 110 into an upper force application oil chamber 111 and a lower force application oil chamber 112;

[0055] The upper force application oil chamber 111, the lower force application oil chamber 112, the top of the inner cavity 210 of the confining pressure barrel, and the bottom of the inner cavity 210 of the confining pressure barrel are all provided with oil transmission channels 510 for connecting with external hydraulic components;

[0056] The sample A is located between the lower end of the force transmission shaft 310 and the inner wall of the bottom of the inner cavity 210 of the confining pressure barrel;

[0057] The lower end of the force transmission shaft 310 is connected with an upper pressure head 340 through a buckle, the inner wall of the bottom of the inner cavity 210 of the confining pressure barrel is provided with a lower pressure head 220, and the sample A is located between the upper pressure head 340 and the lower pressure head 220;

[0058] The confining pressure barrel structure 200 includes a rigid sleeve 231, a lower base 232, and an upper base 233. The lower end of the rigid sleeve 231 is fixed to the lower base 232, and the upper end is fixed to the upper base 233. The rigid sleeve 231, the lower base 232, and the upper base 233 form the inner cavity 210 of the confining pressure barrel;

[0059] The upper end of the force application oil chamber structure 100 is provided with a sealing cover 120, and the lower end is fixedly connected to the upper base 233;

[0060] One end of the first channel 520 is connected to the upper end of the sample A, and the other end sequentially penetrates the upper pressure head 340 and the lower base 232 and communicates with the outside; one end of the second channel 530 is connected to the lower end of the sample A, and the other end sequentially penetrates the lower pressure head 220 and the lower base 232 and communicates with the outside.

[0061] It further includes an ultrasonic transmitting and receiving device 640, an ultrasonic signal wire 650, an ultrasonic pressing spring 660, and an ultrasonic testing system 670; ultrasonic transmitting and receiving devices 640 are arranged at the lower end of the upper pressure head 340 and the upper end of the lower pressure head 220, the ultrasonic pressing spring 660 is arranged on the ultrasonic transmitting and receiving device 640, and one end of the ultrasonic signal wire 650 is connected to the ultrasonic pressing spring 660 and the other end is connected to the ultrasonic testing system 670;

[0062] It also includes a lateral displacement sensor 710 and an axial displacement sensor 720. The lateral displacement sensor 710 is arranged on the left and right sides of the sample A, and the lower end of the axial displacement sensor 720 is connected to the lower base 232, and the upper end is connected to the extension 341 of the upper platen 340.

[0063] It also includes a temperature control system 800, which includes a temperature control outer lining 810, a temperature sensor 820 and a temperature control console 830. The temperature control outer lining 810 wraps the force-applying oil chamber structure 100 and the confining pressure barrel structure 200, and the temperature control outer lining 810 is connected to the temperature control console 830 through a temperature wire 811. The temperature sensor 820 is arranged on the inner wall of the top of the inner cavity 210 of the confining pressure barrel.

[0064] It also includes a resistivity testing system 900, which includes an upper electrode plate 910, a lower electrode plate 920, a wire 930 and a resistivity testing system 940. The upper electrode plate 910 is installed at the upper end of the sample A, and the lower electrode plate 920 is installed at the lower end of the sample A. The upper electrode plate 910 and the lower electrode plate 920 are respectively connected to the resistivity testing system 940 through the wire 930.

[0065] It also includes a gas cylinder 550. The gas cylinder 550 is connected to the second channel 530 through a first flow meter 561, a first flow and pressure gauge 571 and a gas stop valve 581 in sequence, and the gas cylinder 550 is provided with a gas cylinder switch valve 540. The first channel 520 is connected with a second flow meter 562, a second flow and pressure gauge 572 and a stop valve 582 outside the lower base 232 in sequence.

[0066] It also includes an internal strain testing device 400, which is located inside the sample A. The internal strain testing device 400 includes an LVDT housing 410, a conversion cone housing 420 and a base housing 430 from top to bottom in sequence. The upper end of the LVDT 411 is located outside the LVDT housing 410, and the lower end is located inside the LVDT housing 410. The upper end of the conversion cone 421 is located inside the LVDT housing 410 and contacts the lower end of the LVDT 411, and the lower end is located inside the conversion cone housing 420. The upper end of the base 431 is located inside the base housing 430.

[0067] One end of a plurality of compression probes 440 contacts the inner wall of the sample A, and the other end radially passes through the conversion cone housing 420 and contacts the lower end of the conversion cone 421. The contact part of the compression probe 440 and the conversion cone 421 is an inclined platform 441, and a semi-compression spring 442 is arranged inside the compression probe 440.

[0068] The inclination angle of the inclined platform 441 is 45°. A combined fixing gasket 450 is arranged between the LVDT housing 410 and the conversion cone housing 420.

[0069] Consider the usage method of the acoustic-electric-force combined measurement device for compressed air energy storage under the rotation of the stress principal axis, which is characterized by the following steps:

[0070] Step 1: Install the hollow rock sample A, bond the lower end of the sample A to the lower pressing head 220 with epoxy resin glue, and bond the upper end to the upper pressing head 340 with epoxy resin glue;

[0071] Step 2: Install the lower base 232, dock and seal the rigid sleeve 231 with the lower base 232 to form the reaction space for the sample A; the upper pressing head 340 is snap-connected to the force transmission shaft 310, and the lower end of the force application oil chamber structure 100 is fixedly connected to the upper base 233;

[0072] Step 3: Use the controller to perform peripheral confining pressure oil injection through the oil delivery channel 510 at the top of the inner cavity 210 of the confining pressure barrel, and use the first channel 520 to inject oil into the cavity inside the hollow rock sample A to provide the inner confining pressure; inject oil into the axial force upper force application oil chamber through the oil delivery channel 510 of the axial force upper force application oil chamber 111, and then push the piston 320 to apply the axial force; use the combined torque transmission structure 330 to push the force transmission shaft 310 to perform circular motion to provide torque for the hollow rock sample A, and the torque application control system controls the torque application rate;

[0073] Step 4: Turn on the temperature control system 800, use the temperature control outer lining 810 to heat the measuring device, and keep the temperature constant after reaching the set expected test target temperature to perform the rock hollow cylinder torsional shear test at different temperatures;

[0074] Step 5: When performing the resistivity test, after the upper electrode plate 910 discharges the sample A, the current is transmitted to the resistivity test system 940 through the lower electrode plate 920 and the wire 930, and then the change in resistivity under different environmental conditions is obtained;

[0075] Step 6: When performing the ultrasonic experiment test, the ultrasonic signal wire 650 transmits the signal to the ultrasonic test system 670 to detect the waveform of the internal structure change of the sample A during the experiment, and complete the relevant ultrasonic test;

[0076] Step 7: When performing the compressed air energy storage test, open the gas cylinder switch valve 540 and the 207 air stop valve 581, observe the first flow meter 561 and the first flow pressure gauge 571, record their values, adjust the air stop valve 581 to the test target pressure, and observe the second flow meter 562 and the second flow pressure gauge 572 by adjusting the stop valve 582 until the target pressure required for the test; perform the compressed air energy storage test under different environments by coupling with the temperature torsional shear test;

[0077] Step 8: Oil is supplied to the downward force application oil chamber 112 through the oil supply channel 510 of the downward force application oil chamber 112 to push the piston 320 to move upward for unloading. At the same time, oil is pumped and unloaded in the reaction space through the oil supply channel 510 at the bottom of the inner cavity 210 of the confining pressure barrel, and oil is pumped and unloaded inside the specimen A through the second channel 530. After removing the lower base 232, the specimen A is removed to complete multi-parameter measurement.

[0078] In step 1, the internal strain test device 400 is placed inside the specimen A and fixed.

[0079] The usage method of the internal strain test device 400 includes the following steps:

[0080] The compression probe 440 abuts against the inner wall of the specimen A to elongate or contract.

[0081] When the semi-compression spring 442 contracts, the tip of the conversion cone 421 moves upward to the upper end of the inclined platform 441, causing the conversion cone 421 to rise and driving the LVDT 411 to rise.

[0082] When the semi-compression spring 442 elongates, the tip of the conversion cone 421 moves downward to the lower end of the inclined platform 441, causing the conversion cone 421 to descend and driving the LVDT 411 to descend.

[0083] The inclined platform 441 is made at 45°, and the height of the rise or fall of the conversion cone 421 is the displacement generated in the transverse direction of the specimen A.

[0084] In actual use, the lower pressing head 220 is fixed to the lower base 232 through the second fixing bolt 221; the sealing cover 120 is fixed to the upper end of the force application oil chamber structure 100 through the first fixing bolt 121; the lower base 232 and the upper base 233 are fixedly connected through the third bolt 234; it is convenient for disassembly and maintenance.

[0085] The combined torque transmission structure 330 is connected to the force transmission shaft 310 through the rigid bolt 331, so that the torque is applied to the force transmission shaft 310; when applying torque, the entire measuring device remains stationary relative to the force transmission shaft 310 to avoid causing data errors.

[0086] The upper pressing head 340 and the upper base 233, the lower pressing head 220 and the lower base 232 are for various test sensors to enter.

[0087] Sealing rings are provided between the lower base 232 and the rigid sleeve 231, between the upper base 233 and the rigid sleeve 231, and between the upper base 233 and the force transmission shaft 310. The outside of the specimen A is wrapped with an anti-permeation heat shrinkable sleeve.

[0088] The ultrasonic transmitting and receiving device 640 is respectively installed on the upper platen 340 and the lower platen 220, and the ultrasonic signal wire 650 transmits the signal to the ultrasonic testing system 670 to detect the waveform of the internal structure change of the specimen A during the experiment, thus completing the ultrasonic testing experiment.

[0089] The internal strain testing device 400 is placed inside the specimen A, and the base 431 is fixed with bolts.

[0090] The tip of the LVDT 411 probe contacts the upper end of the conversion cone 421. The conversion cone housing 420 and the combined fixing gasket 450 play a role in fixing and guiding the conversion cone 421, and the conversion cone 421 receives the probe of the LVDT 411.

[0091] The compression probe 440 passes through the conversion cone housing 420 so that the tip at the lower end of the conversion cone 421 is on the inclined platform 441 at the upper end of the compression probe 440; there are three compression probes 440.

[0092] The compression probe 440 contains a semi-compression spring 442 inside, enabling the compression probe 440 to measure the displacement generated by the specimen A inwards and outwards.

[0093] When conducting the compressed air energy storage test, the first channel 520 and the second channel 530 are changed into gas channels.

[0094] The present invention changes the temperature under the condition of controllable temperature to simulate high and low temperatures, and can realize the loading in the axial and horizontal directions to complete the temperature-mechanical coupling hollow cylinder torsional shear test.

[0095] During the process of controllable temperature change in the present invention, an ultrasonic testing system 670 is added to simulate the ultrasonic testing during the hollow cylinder torsional shear test of rock under different temperature and pressure conditions, detect the waveforms generated by the rock under different test conditions, and conduct ultrasonic testing.

[0096] During the process of controllable temperature change in the present invention, a resistivity testing system 940 is added to simulate the resistivity testing during the hollow cylinder torsional shear test of rock under different temperature and pressure conditions.

[0097] During the process of controllable temperature change in the present invention, a compressed air energy storage test is added. In view of the non-negligible influence of pressure and temperature on the underground gas storage project under complex terrain and geological conditions, a compressed air energy storage test system is added, which can realize the simulation test study of compressed air energy storage considering the effect of stress principal axis rotation.

[0098] In summary, the present invention can well simulate the engineering construction conditions under complex underground conditions, and adopt servo loading devices, temperature and air pressure loading systems, ultrasonic waves, resistivity and other testing means to carry out a combined test of temperature-stress-acoustic wave-resistivity considering the stress principal axis rotation effect.

[0099] Other parts not described belong to the prior art.

Claims

1. Consider the acoustic-electric-force combined measurement device for compressed air energy storage under the rotation of the principal stress axis, characterized in that: It includes a force - applying oil - cavity structure (100), a confining - pressure barrel structure (200), and a force - transmitting structure (300). Inside the force - applying oil - cavity structure (100) is a force - applying oil cavity (110). The confining - pressure barrel structure (200) is located at the bottom of the force - applying oil - cavity structure (100). Inside the confining - pressure barrel structure (200) is a confining - pressure barrel inner cavity (210). The force - transmitting structure (300) includes a force - transmitting shaft (310), a piston (320), and a combined torque - transmitting structure (330). The upper end of the force - transmitting shaft (310) is connected to the combined torque - transmitting structure (330), and the lower end sequentially penetrates the force - applying oil - cavity structure (100), the force - applying oil cavity (110), the confining - pressure barrel structure (200) from top to bottom and is located inside the confining - pressure barrel inner cavity (210). The piston (320) is sleeved on the part of the force - transmitting shaft (310) located in the force - applying oil cavity (110), and the piston (320) divides the force - applying oil cavity (110) into an upper force - applying oil cavity (111) and a lower force - applying oil cavity (112). Oil - transfer channels (510) for connecting with external hydraulic components are provided at the top of the upper force - applying oil cavity (111), the bottom of the lower force - applying oil cavity (112), the top of the confining - pressure barrel inner cavity (210), and the bottom of the confining - pressure barrel inner cavity (210). The sample (A) is located between the lower end of the force - transmitting shaft (310) and the inner wall of the bottom of the confining - pressure barrel inner cavity (210). The lower end of the force - transmitting shaft (310) is connected with an upper pressing head (340) through a buckle. The inner wall of the bottom of the confining - pressure barrel inner cavity (210) is provided with a lower pressing head (220). The sample (A) is located between the upper pressing head (340) and the lower pressing head (220). The confining - pressure barrel structure (200) includes a rigid sleeve (231), a lower base (232), and an upper base (233). The lower end of the rigid sleeve (231) is fixed to the lower base (232), and the upper end is fixed to the upper base (233). The rigid sleeve (231), the lower base (232), and the upper base (233) form the confining - pressure barrel inner cavity (210). The upper end of the force - applying oil - cavity structure (100) is provided with a sealing cover (120), and the lower end is fixedly connected to the upper base (233). One end of a first channel (520) is connected to the upper end of the sample (A), and the other end sequentially penetrates the upper pressing head (340) and the lower base (232) and communicates with the outside. One end of a second channel (530) is connected to the lower end of the sample (A), and the other end sequentially penetrates the lower pressing head (220) and the lower base (232) and communicates with the outside. It further includes an ultrasonic transmitting and receiving device (640), an ultrasonic signal wire (650), an ultrasonic pressing spring (660), and an ultrasonic testing system (670). Ultrasonic transmitting and receiving devices (640) are provided at the lower end of the upper pressing head (340) and the upper end of the lower pressing head (220). The ultrasonic pressing spring (660) is arranged on the ultrasonic transmitting and receiving device (640). One end of the ultrasonic signal wire (650) is connected to the ultrasonic pressing spring (660), and the other end is connected to the ultrasonic testing system (670). It further includes a temperature control system (800), and the temperature control system (800) includes a temperature control outer liner (810), a temperature sensor (820) and a temperature control console (830); the temperature control outer liner (810) wraps the force - applying oil chamber structure (100) and the confining pressure barrel structure (200), and the temperature control outer liner (810) is connected to the temperature control console (830) through a temperature wire (811); the temperature sensor (820) is arranged on the inner wall of the top of the confining pressure barrel inner cavity (210). It further includes a resistivity testing system (900), and the resistivity testing system (900) includes an upper electrode plate (910), a lower electrode plate (920), a wire (930), and a resistivity testing system (940). The upper electrode plate (910) is installed at the upper end of the sample (A), the lower electrode plate (920) is installed at the lower end of the sample (A), and the upper electrode plate (910) and the lower electrode plate (920) are respectively connected to the resistivity testing system (940) through the wire (930).

2. The acoustic-electric-force combined measurement device for compressed air energy storage considering the rotation of the stress principal axis according to claim 1, characterized in that: It further includes a gas cylinder (550), and the gas cylinder (550) is connected to the second channel (530) through a first flow meter (561), a first flow pressure gauge (571), and a gas stop valve (581) in sequence. The gas cylinder (550) is provided with a gas cylinder switch valve (540); the first channel (520) is sequentially connected with a second flow meter (562), a second flow pressure gauge (572), and a stop valve (582) outside the lower base (232).

3. The acoustic-electric-force combined measurement device for compressed air energy storage considering the rotation of the stress principal axis according to claim 1, wherein: It further includes an internal strain testing device (400), and the internal strain testing device (400) is located inside the sample (A). The internal strain testing device (400) includes an LVDT housing (410), a conversion cone housing (420), and a base housing (430) from top to bottom in sequence; the upper end of the LVDT (411) is outside the LVDT housing (410), and the lower end is inside the LVDT housing (410); the upper end of the conversion cone (421) is inside the LVDT housing (410) and contacts the lower end of the LVDT (411), and the lower end is inside the conversion cone housing (420); the upper end of the base (431) is inside the base housing (430). One end of a plurality of compression probes (440) contacts the inner wall of the sample (A), and the other end radially passes through the conversion cone housing (420) and contacts the lower end of the conversion cone (421). The contact part between the compression probe (440) and the conversion cone (421) is an inclined platform (441), and a semi - compression spring (442) is arranged inside the compression probe (440).

4. The acoustic-electric-force combined measurement device for compressed air energy storage considering the rotation of the stress principal axis according to claim 3, characterized in that: The inclination angle of the inclined platform (441) is 45°; a combined fixing gasket (450) is arranged between the LVDT housing (410) and the conversion cone housing (420).

5. Consider the usage method of the acoustic-electric-force joint measurement device for compressed air energy storage under the rotation of the principal stress axes, characterized in that It includes the following steps: Step 1: Install the hollow rock sample specimen (A), bond the lower end of the specimen (A) to the lower pressure head (220) with epoxy resin glue, and bond the upper end of the specimen (A) to the upper pressure head (340) with epoxy resin glue. Step 2: Install the lower base (232), dock and seal the rigid sleeve (231) with the lower base (232) to form a reaction space for the specimen (A); the upper platen (340) is snap-connected to the force transfer shaft (310), and the lower end of the force application oil chamber structure (100) is fixedly connected to the upper base (233); Step 3: The oil supply channel (510) at the top of the inner cavity (210) of the confining pressure barrel is used to supply oil for the peripheral confining pressure by the controller, and the first channel (520) supplies oil into the cavity inside the hollow rock specimen (A) to provide the inner confining pressure; oil is supplied into the axial force application oil chamber through the oil supply channel (510) of the upper force application oil chamber (111) of the axial load, thereby pushing the piston (320) to apply the axial force; the force transfer shaft (310) is pushed to make a circular motion through the combined torque transmission structure (330) to provide torque for the hollow rock specimen (A); Step 4: Turn on the temperature control system (800), use the temperature control outer liner (810) to heat the measuring device, and keep the temperature constant after reaching the set expected test target temperature to conduct the rock hollow cylinder torsional shear test at different temperatures; Step 5: When performing the resistivity test, the upper electrode plate (910) discharges the specimen (A), and then the current is transmitted to the resistivity test system (940) through the lower electrode plate (920) and the wire (930), thereby obtaining the change of resistivity under different environmental conditions; Step 6: When performing the ultrasonic experiment test, the signal is transmitted to the ultrasonic test system (670) by the ultrasonic signal wire (650) to detect the waveform of the internal structure change of the specimen (A) during the experiment, and complete the relevant ultrasonic test; Step 7: When performing the compressed air energy storage test, open the gas cylinder switch valve (540) and the 207 air stop valve (581), observe the first flow meter (561) and the first flow and pressure gauge (571), record their values, adjust the air stop valve (581) to the test target pressure, and observe the second flow meter (562) and the second flow and pressure gauge (572) by adjusting the stop valve (582) until the target pressure required for the test; conduct the compressed air energy storage test under different environments by coupling with the temperature torsional shear test; Step 8: Oil is supplied into the lower force application oil chamber (112) through the oil supply channel (510) of the lower force application oil chamber (112) to push the piston (320) to move upward for unloading. At the same time, oil is pumped out through the oil supply channel (510) at the bottom of the inner cavity (210) of the confining pressure barrel in the reaction space, and oil is pumped out inside the specimen (A) through the second channel (530). After removing the lower base (232), the specimen (A) is removed to complete the multi-parameter measurement.

6. The method for using the acoustic-electric-force joint measurement device for compressed air energy storage considering the rotation of the stress principal axis according to claim 5, wherein, In Step 1, place the internal strain test device (400) inside the specimen (A) and fix it; The usage method of the internal strain test device (400) includes the following steps: The compression probe (440) abuts against the inner wall of the specimen (A) to elongate or contract; When the semi-compression spring (442) contracts, the tip of the conversion cone (421) moves upward to the upper end of the inclined platform (441) to raise the conversion cone (421), driving the LVDT (411) to rise; When the semi-compressed spring (442) elongates, the tip of the conversion cone (421) moves towards the lower end of the inclined platform (441), causing the conversion cone (421) to descend and driving the LVDT (411) to descend. The inclined platform (441) is made at 45°, and the height by which the conversion cone (421) rises or falls is the displacement generated in the transverse direction of the specimen (A).

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